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There's Always a Bigger Train
Engineer the ironic demise of an Exulting Wind-Up Train Wrecker in Blackrock Foundry on Normal difficulty or higher.
There's Always a Bigger Train is a 10-point Blackrock Foundry achievement earned by letting an encounter train run over an Exulting Wind-Up Train Wrecker during the Operator Thogar fight on Normal difficulty or higher.
Obtain the Required Toys
Purchase the 
Toy Train Set and the 
Wind-Up Train Wrecker from Blax Bottlerocket in Orgrimmar, Craggle Wobbletop in Stormwind, or Jepetto Joybuzz in Dalaran.
Enter and Pull Operator Thogar
Enter Blackrock Foundry on Normal difficulty or higher, engage Operator Thogar, and immediately run to the train track furthest away from the boss's starting position.
Place Toys and Wait
Wait roughly 8 to 9 seconds after the pull, place the Toy Train Set on the far track, then immediately place the Wind-Up Train Wrecker on top of it — the Wrecker takes about 5 seconds to destroy the Train Set and will then dance for 10 seconds as the Exulting Wind-Up Train Wrecker, during which the encounter's incoming train must run it over to complete the achievement.
Tips
This is a raid-wide achievement, so only one person needs to execute the toy placement for the entire group to receive credit.
Warn any light-sensitive players to look away before the train hits the Exulting Wind-Up Train Wrecker, as it triggers a very bright, large flash.
For additional visual guidance, see the video guides linked with this achievement.