If you work after your disability benefits begin, you may be entitled to a trial work period (TWP). This is a period of time where you may test without penalty your ability to work and still be considered disabled. A TWP may last 9 months (not necessarily consecutive) in a 60-month period. After the TWP is complete, the RRB will decide whether you are still disabled. Some limitations apply to the TWP. Due to the complexity of determining whether you qualify for the TWP, you should contact an RRB representative before returning to work.