Here is the full list of all 36 Golden Rails: World’s Fair achievements.
Find every owl
Complete the construction of the exhibition
Complete the Collector's Edition with 3 stars
Load 5,000 units of resources onto trains
Open 30 stores
Build 200 houses
Build and repair 100 sections of railway
Complete the Exhibition with 3 stars
Plant 100 flower gardens
Extinguish 50 fires
Earn 3 stars at 5 shooting ranges
Collect 200 tools
Complete the Plains with 3 stars
Complete the Rivers with 3 stars
Collect 1000 limestones
Collect 100 limestones
Open 10 stores
Complete the Snow with 3 stars
Complete the City with 3 stars
Collect 10,000 units of iron
Collect 50 bundles of dynamite
Build a Ferris wheel
Collect 10,000 units of gold
Complete the Forest with 3 stars
Gather 10,000 units of wood
Gather 10,000 units of food
Earn 3 stars at a shooting range
Complete the Suburbs with 3 stars
Extinguish 10 fires
Collect 1000 coals
Collect 100 coals
Assign 5 tasks at the same time
Collect 100 units of iron
Gather 100 units of wood
Collect 100 units of gold
Gather 100 units of food