As for smoke fluid, its use with the lamp type smoke unit was discussed here earlier this year. You might want to search and see if you can find that thread. For 2, i have never had any trouble with the horizontal e-unit. They work just fine. On 3, there are ceramic insulators around each screw that holds the collector assembly on. These are frequently cracked. This does not make any difference until you take it apart. Before removing the collector assembly I would recommend that you have a spare set of these insulators. There are nylon repros out there that would not crack like the original, but I have never tried them. On 4, I have never had trouble with the drive train, I run four '46 726s, but due to the dual worm drive, it could be very tricky if you want to press wheels on and off the axles. Getting the timing between the worm wheel teeth and the crank pins might be hard to do without hard tooling. I have ask about this in the past, but never got an answer. The '46 726 is usually more expensive than the '47 to '49 version and parts for it are harder to find. I would suggest only getting the '46 locomotive if it has features you really want.
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