Algodoo

Essentially my Mk.4 tank; chassis and body work is roughly based off the Triaros Armoured Conveyer; a transport used by the Taghmata in the 31st millenium.
(It's a Warhammer 40k (30k?) model)

The Triaros has some glaringly awful design points about it for a tank. The electrified cow catcher on the front completely screws with traversing rough terrain, and the chassis seems to be based off a ruddy train cart.
I've made sensible improvements to the chassis, to allow for a suspension system. Main hull isn't actually rigidly connected to the drive chain frame.

Uses my Agrellan Spring engine, with 12 gears. Boosted the output by fiddling with the engine-side gearing; too slow, and it just didn't spin fast enough to shift this.

Tap Q for anti-clockwise output. (Rightward motion)
Tap A for clockwise output. (Leftward motion)
Press Z to stop the engine.

To change the spin of the engine, stop it first.

Wheel brakes are on S.

14 gears, 2 sets of 7:
First set is connected by pressing G, and then cycle through the 7 gears on R, 1-6, all on toggle.
Second set is on F, which you then cycle through 1-6 with.
(Can get away with just using the Second set if you really want to move, but low set is there anyway).
(But keep in mind, G-1 can exceed 90 m/s)
(G-R, however, is very slow)

Engine output won't be translated to the gear box without either being in F or G, gear box output won't translate into the drive chain unless you're in a gear.

[Silly historical design issue with my 10m scale gear box: Always starts with 6th gear activated. Switch it off before doing anything]

There's a hilly course rightward to traverse.

Top speed: 326 m/s, 729 mph
(Double the top speed of my Mk.3 tank, 45 mph shy of the land speed record)
(Actual thing's probably only designed to go up to 20 mph)

Update, 11/02/2017: Achieved a top speed of 393.7 m/s, 880.7 mph, Mach 1.147.
Required fine tuning attempts with the track spring damping, working rather well at a humble 2.0, although that is most unsuitable for navigating the hilly course.

Update, 12/02/2017: Achieved a top speed of 839.5 m/s, 1877.9 mph, Mach 2.45.
Removed the tracks and stuck 2 wheels on the main output gears. (2 things need to have their collision layers taken off, mind)[Wheels used are to the left of the text box]
Took 100 seconds for this thing to come to a complete stop.

------------------------------------------------------
------------------------------------