All information are from the RailCar.com, learn more about Class 101 and BR Blue in the Types-Class 101-Livery
Since 1967, Rail Blue was applied on DMU. Some early version has a Yellow Panel around the same size of the BR Green one with a red buffer. On Eastern Region and Scottish Area, some has a slightly bigger Yellow Panel that covered the whole lower body. Another short lived version has not only a full yellow end but also covered the driver doors. The majority of the Rail Blue does not cover the door, with some having a 1st class stripe.
YP: TVL Ver Add Yellow Panel
ER YP: Eastern Region Yellow Panel
YCD: Yellow Cab Door
FYE: Full Yellow End
FYE 1st: Full Yellow End, with 1st Class Stripe
This livery share the base from the YorkLad's Class 101 Rail Blue, with the Full Yellow End one as the direct upgrade of that livery with adjusted place of the words.
Notice despite I said the Yellow Panel one 'has a red buffer', I forgot to actually change the colour, I will update it later.
Diesel Legends of the Great Western (GWB) DLC
Raging Lighting's TSW2 Livery Manager
Muff's Logo Pack 1.3
See this video: