They all hum that way. It's because they don't know the words...
Seriously, to check the transformer you need an electrical multi-tester. Simply touch the test leads to the binding posts and see if the readout displays the correct votage as shown on the transformer. My guess is that you will find the transformer is fine, and the problem is on the locomotive end. Of course since you've got the meter out you should also check the voltage at the track. Just in case it's a bad connection somewhere along the line.
When you cycle the power, do you hear a clicking sound coming from the locomotive or the tender? That clicking sound is the relay that controls the locomotive's direction. It's the most common point of failure in these locomotives.
I have figured out what is wrong with my brain! On the left side nothing works right, and on the right side there is nothing left!
In addition to what stebbycentral said also clean and polish your wheels and clean the track. One other area to check is the drum and fingers on the reversing unit. A dirty drum or worn fingers will prevent the locomotive from operating. If replacement parts are needed they can be procured from Port Line Hobbies. As always you should ensure the motor is cleaned lubricated with new oil, that the brushes are not worn and the brush springs are not weak or broken. Also check for any broken wires.
Be sure the reversing unit isn't locked into the neutral state. I don't have my Flyer information with me; but others can correct me if I am wrong in saying that the lever for that is probably under the tender.
Bob Nelson
How many wires are there between the engine and tender on the 342 in question? I ask that because the 342 came in AC and DC only versions.
With the locomotive on the track, does the headlight work? If so, as suggested, make sure the reverse unit is not locked in neutral. The lever is under the tender frame. Move it in both directions, and see if you get a response. If you hear the reverse unit buzz or click, but the loco does not move, then clean the wheels on both the loco and tender, and track. If still no movement, then it is service time.
Larry
I agree with stebby central that it is probably not the transformer, but just out of curiosity, what type and model of transformer is it?
I had similar problems a few years back with my old American Flyer 312 when I brought it out of 40 year storage. It simply wouldn't run. Turned out to be the reversing unit in the tender. A hole was worn straight through the end of one of the copper fingers that makes electrical contact with the copper drum. I replaced the copper finger assembly and it came back to life.
Another thing to check is the wiring harness running from the tender to the engine. A broekn wire or loosened solder contact could be the problem.
Keep us posted as you investigate your problem. All of this stuff is easily fixable.
Rich
Alton Junction
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