I recently acquired a Williams berk 107, Berkshire 2-8-4 engine and tender (blue) Jersey Central  Cab # 8803, along with a 4 car set Jersey Central (blue comet) 60' Madison. Stock # M1007. My problem is I can find any information on them. Looking for year made, value, anything to put my mind at ease. (did I overpay?) Very new to train collecting.