Most Bachmann applied paint (lining, numbers, names, totems, warning plates) may be removed with just a little white spirit (paint thinner/brush cleaner). Apply it in a way that you can control the application to just the desired area, and don't rub: a cotton bud is usually a good choice. Sometimes it needs more than one application, but it will effect a clean removal with no marks on the underlying paint. T-Cut will do the job, but typically leaves a polished patch. That's my usual method on Hornby, whose paint resists removal by paint thinner.