@Mark Holmgren 110217 Mark, Lots of good advice in this topic for you. Most of the replies here are for post-war purchases. Most of my purchases are pre-war. So, this is my spin on all of this and most of my locomotives are now around 85 years old (prewar is 1939 to 1942)...if this helps to give you a slightly different prospective. If I had an old comedian here to sum things up about prewar...(like the late, great Rodney Dangerfield) he might say, "So, you think you have problems..."
I buy from the most common auction site and like most here, I think I know who you are referring to for your seller. I generally have zero problems with both places and the big auction site represents maybe 95% of my locomotives.
Having said that, I don't rely on TCA grading standards. Some or most will not agree with that, but that's just me. When purchasing my prewar locomotives I can usually tell how the locomotive has been handled by most of the pictures that are provided online. If the pictures do not give me good views or I don't like how the item is described, I will pass. I do take into account that my locomotives are in the 85 year old range.
Seven or eight years ago, I stumbled a loco that I took a chance on. I had a pretty good idea what I was getting into. This was the saddest, most beaten up "basket-case switchers" which needed extensive repairs, including wiring, several parts, body work (the cab) and painting. I shipped the loco to Hennings for the wiring and I did the rest with a friend, using Jeff Kane, the Train Tender, for parts...I recommend both of them highly. Here is the link for that basket case getting restored if it helps see something going from the worst possible case.
https://ogrforum.com/...team-switcher?page=1
I see that some sellers on the big auction site sometimes do not say the locomotive has been tested...OK, I take that into account. If I still like the looks of the locomotive, I may buy it and be prepared to clean it. Most of my locos that do not originally run can be brought back to life with a thorough cleaning. If the locomotive has been tested and the locomotive runs, that is like gravy to me. Again, that's just me. Some of my online sellers, I've bought from before, so I get a better feeling of who I an dealing with and if I can trust them.
I will mention that one of the best running prewar Lionel steam switchers that I ever bought was from Trainz. I would imagine they may have had to rewire and thoroughly clean that locomotive to have it run so well.
Things to remember...whether these locomotives are 30 years old or 85 years old or somewhere in-between, sending them through the mail/UPS/FedEx to you is not going to improve how they run. If you had fragile wiring before, you may end up with a wire or wiring that can get loose in shipment.
You asked these questions:
- If the listing does not explicitly say a locomotive has been tested and works, should I just assume it does not work? My answer...I would assume it does not work...but a good cleaning may be the solution.
- And if an MPC locomotive won't move, how much should I have expected to spend in parts to get it going again? My answer...this is something you need to decide. A general rule of thumb I try to stick to is roughly in the $100-200 range. It all depends what your budget is.
- This one hummed, so the motor was getting power. Would that have been the E-unit? My answer...this is generally a good sign! You may be just a cleaning away from bringing it back to life.
If you don't have a good cleaning/repair manual for Lionel trains, you may want to invest in one and keep it handy.
So, the age old slogan applies here, too, Caveat Emptor, "Buyer beware!"
Tom