In Bolivia, Zay Harding travels along the railways from the Brazilian Pantanal tropical wetlands to the Chilean coast. Episode 1 season 1.

Starting his journey in the north of Vietnam, Zay Harding discovers that the railway has played a vital role in the recent history of the country. Episode 3 season 1.

Starting his journey in the north of Vietnam, Zay Harding discovers that the railway has played a vital role in the recent history of the country. Episode 3 season 1.

Starting his journey in the north of Vietnam, Zay Harding discovers that the railway has played a vital role in the recent history of the country. Episode 3 season 1.

Starting his journey in the north of Vietnam, Zay Harding discovers that the railway has played a vital role in the recent history of the country. Episode 3 season 1.

Starting his journey in the north of Vietnam, Zay Harding discovers that the railway has played a vital role in the recent history of the country. Episode 3 season 1.

Zay Harding travels to the far north of Siberia, deep inside the Arctic Circle, on the world's most northerly railway lines. Episode 2 season 1.

Zay Harding travels to the far north of Siberia, deep inside the Arctic Circle, on the world's most northerly railway lines. Episode 2 season 1.

Zay Harding travels to the far north of Siberia, deep inside the Arctic Circle, on the world's most northerly railway lines. Episode 2 season 1.

Zay Harding travels to the far north of Siberia, deep inside the Arctic Circle, on the world's most northerly railway lines. Episode 2 season 1.

Zay Harding travels to the far north of Siberia, deep inside the Arctic Circle, on the world's most northerly railway lines. Episode 2 season 1.

In Bolivia, Zay Harding travels along the railways from the Brazilian Pantanal tropical wetlands to the Chilean coast. Episode 1 season 1.

In Bolivia, Zay Harding travels along the railways from the Brazilian Pantanal tropical wetlands to the Chilean coast. Episode 1 season 1.

In Bolivia, Zay Harding travels along the railways from the Brazilian Pantanal tropical wetlands to the Chilean coast. Episode 1 season 1.

In Bolivia, Zay Harding travels along the railways from the Brazilian Pantanal tropical wetlands to the Chilean coast. Episode 1 season 1.

In Bolivia, Zay Harding travels along the railways from the Brazilian Pantanal tropical wetlands to the Chilean coast. Episode 1 season 1.

Zay Harding travels on one of the greatest engineering feats of the 19th century - the Transcontinental Railroad, a monumental line that united the US, from the Atlantic to the Pacific, through four time zones and 12 states. Episode 6 season 1.

Zay Harding travels on one of the greatest engineering feats of the 19th century - the Transcontinental Railroad, a monumental line that united the US, from the Atlantic to the Pacific, through four time zones and 12 states. Episode 6 season 1.

Zay Harding travels on one of the greatest engineering feats of the 19th century - the Transcontinental Railroad, a monumental line that united the US, from the Atlantic to the Pacific, through four time zones and 12 states. Episode 6 season 1.

Zay Harding travels on one of the greatest engineering feats of the 19th century - the Transcontinental Railroad, a monumental line that united the US, from the Atlantic to the Pacific, through four time zones and 12 states. Episode 6 season 1.

Zay Harding travels on one of the greatest engineering feats of the 19th century - the Transcontinental Railroad, a monumental line that united the US, from the Atlantic to the Pacific, through four time zones and 12 states. Episode 6 season 1.

Ian Wright goes on an eye-opening and hair-raising train journey across the Caribbean island of Cuba. Episode 5 season 1.

Ian Wright goes on an eye-opening and hair-raising train journey across the Caribbean island of Cuba. Episode 5 season 1.

Ian Wright goes on an eye-opening and hair-raising train journey across the Caribbean island of Cuba. Episode 5 season 1.

Ian Wright goes on an eye-opening and hair-raising train journey across the Caribbean island of Cuba. Episode 5 season 1.

Ian Wright goes on an eye-opening and hair-raising train journey across the Caribbean island of Cuba. Episode 5 season 1.

Zay Harding takes an epic journey across one of the world's biggest railway networks. Episode 4 season 1.

Zay Harding takes an epic journey across one of the world's biggest railway networks. Episode 4 season 1.

Zay Harding takes an epic journey across one of the world's biggest railway networks. Episode 4 season 1.

Zay Harding takes an epic journey across one of the world's biggest railway networks. Episode 4 season 1.

Zay Harding takes an epic journey across one of the world's biggest railway networks. Episode 4 season 1.

Starting his journey in the north of Vietnam, Zay Harding discovers that the railway has played a vital role in the recent history of the country. Episode 3 season 1.

Starting his journey in the north of Vietnam, Zay Harding discovers that the railway has played a vital role in the recent history of the country. Episode 3 season 1.

Starting his journey in the north of Vietnam, Zay Harding discovers that the railway has played a vital role in the recent history of the country. Episode 3 season 1.

Starting his journey in the north of Vietnam, Zay Harding discovers that the railway has played a vital role in the recent history of the country. Episode 3 season 1.

Starting his journey in the north of Vietnam, Zay Harding discovers that the railway has played a vital role in the recent history of the country. Episode 3 season 1.

Zay Harding travels to the far north of Siberia, deep inside the Arctic Circle, on the world's most northerly railway lines. Episode 2 season 1.

Zay Harding travels to the far north of Siberia, deep inside the Arctic Circle, on the world's most northerly railway lines. Episode 2 season 1.

Zay Harding travels to the far north of Siberia, deep inside the Arctic Circle, on the world's most northerly railway lines. Episode 2 season 1.

Zay Harding travels to the far north of Siberia, deep inside the Arctic Circle, on the world's most northerly railway lines. Episode 2 season 1.

Zay Harding travels to the far north of Siberia, deep inside the Arctic Circle, on the world's most northerly railway lines. Episode 2 season 1.

In Bolivia, Zay Harding travels along the railways from the Brazilian Pantanal tropical wetlands to the Chilean coast. Episode 1 season 1.

In Bolivia, Zay Harding travels along the railways from the Brazilian Pantanal tropical wetlands to the Chilean coast. Episode 1 season 1.

In Bolivia, Zay Harding travels along the railways from the Brazilian Pantanal tropical wetlands to the Chilean coast. Episode 1 season 1.

In Bolivia, Zay Harding travels along the railways from the Brazilian Pantanal tropical wetlands to the Chilean coast. Episode 1 season 1.

In Bolivia, Zay Harding travels along the railways from the Brazilian Pantanal tropical wetlands to the Chilean coast. Episode 1 season 1.

Starting his journey in the north of Vietnam, Zay Harding discovers that the railway has played a vital role in the recent history of the country. Episode 3 season 1.

Zay Harding travels to the far north of Siberia, deep inside the Arctic Circle, on the world's most northerly railway lines. Episode 2 season 1.

The Transcontinental Railroad (GBR 60') Zay Harding travels on one of the greatest engineering feats of the 19th century _ the Transcontinental Railroad, a monumental line that united the US, from the Atlantic to the Pacific, through four time zones and 12 states.

The Transcontinental Railroad (GBR 60') Zay Harding travels on one of the greatest engineering feats of the 19th century _ the Transcontinental Railroad, a monumental line that united the US, from the Atlantic to the Pacific, through four time zones and 12 states.