A comfy cushion in the shape of an iconic London Underground Train.
This train cushion is modelled on the S Stock, currently running on Metropolitan line and District / Circle lines
However, if one looks closely the door configuration is that of a tube train (ie: incorrect for S Stock) and the destination shows High Barnet via CH+ Admittedly if history has been a little different the higher capacity of the larger S stock trains might well have seen them being used on Northern line services to Alexandra Palace / High Barnet (and even perhaps Edgware) from Moorgate via Finsbury Park and Highgate. But definitely not via Charing Cross!
Most people will not care about this inaccuracy, but nevertheless they really should get it spot-on right.
The MerseyRail trains (not sure if it's a cl507 or cl508) can be bought from any M to Go shop.
(For those unaware of the concept, the busiest MerseyRail stations have "M to Go" shops; these sell a range of 'grab and go' style items such as drinks, crisps and confectionery in addition to a full range of travel tickets. The idea being that you make a visit to one place and get everything you need for your journey.)