Train Game Mechanics in Red Dead Redemption 2
You will need to verify the train ahead has passenger cars.
You can't board a running train from the ground.
You must be riding a horse.
And then take out the guard on the back of train.
You have to press square when next to the train.
Clear train of gunmen.
And examine the last train car.
After that, work your way to the front of train.
You are in the frontmost passenger.
It is a mail car containing a safe.
Dynamite safe (R2 button).
Ignite (triangle) and run far away.
You have to take the money clip.
And check the cabinet for praying Mantis Kung Fu.
After that, close the cabinet and take a coin sack.
Kill a lawman if interrupted.
Go to the next car for another safe.
You have to make sure to take a Cigarette card too.
Finish up lawmen.
And then make your way to the train engine (locomotive).
Press triangle to drive the train.
Hold the X button to go forward.
And hold the L2 or L3 bell/whistle.
You can use the touchpad to switch the interior view.
Ring bell, use whistle in 1st person mode.
Touchpad multiple times to view the train afar.
Ring bell, use the whistle from afar.
See train enter tunnel.
You need to go to the next station.
Hold R1 to brake and reverse.
Then drive the train over a bridge.
Triangle to stop driving train.
Dynamite Locomotive.
Wait for the fire to end.
Verify you can't drive a train anymore.
See complete train from front to back.
Attention to detail.