Bachmann 31-423SF 31-423SF Class 411 4-CEP 4-Car EMU (Refurb.). 1522 BR London & South East Sector - DCC Sound. The Bachmann Branchline 4-CEP Electric Multiple Unit (EMU) broke new ground when it was first released and now we’ve created new bodyshells for this award winning model to bring you these new models depicting the refurbished units.