Yeah
Express trains in SWR are numbered as
162xx for MYS Div ( 562xx for Pass )
165xx for SBC Div ( 565xx for Pass )
173xx for UBL Div ( 569xx for Pass )...
more...
For SF it starts with 126xx/226xx/206xx which is common between SR and SWR
For UBL it starts with 127xx , only one train of UBL div i.e, UBL MAS SF uses 226xx series no.
Some trains also use 122xx series no. which is also common among other zones I guess