Duplicate Atco code on stations.

https://www.openstreetmap.org/node/6104595405, Lichfield Trent Valley High Level, AtcoCode 9100LCHTTVH, ref:crs LIF.

https://www.openstreetmap.org/node/6082898473,Lichfield Trent Valley, AtcoCode 9100LCHTTVL, ref:crs LTV

Source: Naptan
