Those rear drivers should spin like the front one so it appears that is where your issue lies. I know that you're not very comfortable working on the engine so taking it to a repair shop may be the next best step. If this was my engine I would try see if the issue was with the rear drivers or the motor by separating those two. There is a screw holding the driving wheel set in place on the bottom. If you decide to try this be very careful as there is some wires there and another piece that the motor need to attache to the wheels to make it actually turn them ( I'd show you a picture of that but the Lionel parts website is currently down). Once the rear wheel set is removed (you don't have to undo the wires, just the connection to the motor) you can then spin the wheels and motor independently from each other. Whichever one feels spongy / stuck vs spins freely will tell you if it's a issue with the wheel or the motor. I will once again caution you on trying this as it would be very easy to loose a piece or otherwise break something. Good luck.
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