TRSBs are standard class, and are numbered in the 404xx range. The only ones now in use as such as the three with Grand Central. A number have been converted into first-class buffets, but in all cases have been renumbered as part of this.
Virgin did use TRSBs on their cross country sets, and these should not have the yellow stripe or the '1' on them. I've just had a look at the photos on Rails' website, and both of the two (40401 and 40434) are incorrect. As part of the same batch Dapol have also produced RFM 10211 in Virgin livery, which is first-class and should therefore have the yellow stripe and the '1'. It appears that they have incorrectly used the same livery for the TRSBs as well.