|“You are so small! Is funny to me!”
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Notes: Neeeds some more location descriptions of stage 2 and 3
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|No. of Stages:||3|
|Health Kits:||×25 • ×24 • ×1|
|Ammo Boxes:||×7 • ×9 • ×21|
Thunder Mountain is a Valve-developed Payload map included with the Engineer Update, revealed on Day 4 thereof. It is the third official Payload map to be developed and released since the Heavy Update, and one of three Payload-based maps released during the Engineer Update, the others being Upward and Hightower (a Payload Race map).
Thunder Mountain is a multi-stage Payload map, like Gold Rush and Hoodoo. Unlike other Payload maps, Thunder Mountain features new gameplay mechanisms not used in earlier maps, including a bridge which must be raised in order for the cart to cross, and sloped tracks, marked with yellow and black caution stripes.
- First Courtyard: Just outside BLU spawn is a courtyard that resembles Gold Rush's Stage A, Checkpoint 1.
- Bridge: At the end of the First Courtyard is a small, tighter section of woodwork that leads to an unraised bridge. By pushing the cart onto the point the bridge raises slowly until it is high enough for the Payload to cross.
- Final Spiral: In Thunder Mountain's final stage is a large tower, which the BLU team slowly climbs over the course of the round until they push it into a hole in the center, detonating the cart.
- On Stage A, in the BLU spawn, the player may see some BLU characters in an area similar to the Soldier Training map, around a blackboard. They will occasionally taunt, albeit with no weapons, and will also occasionally do the Thriller taunt regardless of the time of the year. 
- On Stage B, in the RED spawn, one may see the RED team swimming in a pool.
- On Stage C, near the second checkpoint (third dot), off in the distance the Sniper can be seen near his camper van (the same one seen in Meet the Sniper), a tent, and a fire. He only appears after BLU team has pushed the Payload past the first checkpoint.
- Thunder Mountain was originally teased on Day 1 of the Engineer Update, on the map of Badlands, an area that a number of game maps occupy.
- There is an actual mountain named Thunder Mountain in Sierra Nevada, California; however, Thunder in this case references the history of nuclear weapon development at Los Alamos National Laboratory (see also the mushroom cloud reference on the Engineer Update page).
- Occasionally, a logging train will pass by on the train tracks at stage A.
- In spite of the playback of steam exhaust and steam whistle sounds, A.D.M.E. 105 is in fact a model of a diesel locomotive.
- It is modeled on D&RGW #50, the only narrow gauge diesel that railroad owned (Note the unique mounting of an airbrake cylinder as a coupler-adjusting device on the front.)