I have several PS1 diesel sets (such as the PRR centipede) that have dual motors in each unit. Upgrading to PS3 requires 2 kits (one per 2 motor engine), whereas PS2 upgrades allowed for a slave board to control the second engine. This was available at a reduced cost and it would be great if such an option were made available once again. It also simplified operation because I didn't need to worry about issues associated with a lash-up.
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