I’m relatively new to openstreetmap. Recently while travelling by train I was able to produce a gps track which I uploaded to openstreetmap. The railtrack was not mapped completely so I filled in the gaps. When I revisited the map some days later, there was a second railtrack running in parallel with mine - this was not there before and I assume that somebody has mapped exactly the same track as me. What shall I do now? Delete my track? Delete the other? Shall I contact the other mapper - and if yes - how?