I used two Lumix GH-2 micro four thirds cameras, and two wireless remote controls. A remote receiver was used on each camera to activate the shutter, with a single remote control transmitter. Surprisingly (to me!) the two cameras synchronized very well.
I used two of these wireless remotes. Amazon says they work with any of these cameras – Panasonic: DMC G1, G2, G3, G6, G7, G10, GF1, GH1, GH2, GH3, GH4, GX1, GX7, L1, L10, LC-1, FZ20, FZ20K, FZ20S, FZ20S, FZ30, FZ30K, FZ50, FZ50K, FZ50S, FZ100, FZ200; Leica: DigiLux 2, DigiLux 3, V-Lux 4
This image is in cross-eyed viewing format – both trains were moving in these shots:
Side by Side for parallel or 3D monitor viewing:
Red/cyan anaglyph version:
I have used the dual Lumix GH-2 cameras before but had to manually press the shutters on both cameras at “roughly the same time” – with the manual shutter control, I could not have photographed a subject like these two moving trains.
The inter-axial lens spacing is about 6 inches or 15 cm.