Although Merseytravel posted this video – see link below – on 7th February I had not come across it before. It’s worth watching to see how the new trains are being built and the initial testing of them:-
‘From design concepts to the real thing; watch as the new trains for the Merseyrail network take shape from initial designs to the first train out on the test track in Europe!’
As I post this Merseyrail (still operating Class 507 & 508 units of course) have had their first Stadler unit (777 003) out on nocturnal testing along the Kirkby line of recent nights.
NOTE – Merseyrail are only offering a 30 minute frequency service presently due to the health crisis we find ourselves in.