This TVT 701 unit is Powered Catenary Maintenance Rail Cars and a good one. Build in 1968 at manufacturer Uerdingen in Germany. At this moment a caternary company use it and its full working, because the service times ending in short. You can be sure, all is in good conditions, nothing is to do. Remove all the graffity outside ( a sprayer problem in Germany...) repaint and work with this TVT. The rail security module PZB 90 will be removed before sold.