There is a way of improving parts (motor shield)- Page 4
Marklin 60944 - High Performance Motor Retrofit Set : Amazon.se: Arts & Crafts
Amazon.com: Marklin HO American Digital Premium USA New York Central Starter Set 29571 with ALCO 66 with Sounds+Oval C Tracks WSWITCHES+TRANSF.110V.-32V.A.+DIG.Mobile Station Controller+Catalog : Toys & Games