I suggest using the Holo model "plane" when using as a hologram in E2/EA2/ any other scripting entities equivelant planar model

You can use the model "models/bobsters_trains/misc/plane_mirrored.mdl" to mirror decals

UK
bobsters_trains/decals/british_railways_logo
bobsters_trains/decals/drs
bobsters_trains/decals/drs_full
bobsters_trains/decals/gwr_logo
bobsters_trains/decals/gwr_great
bobsters_trains/decals/gwr_western
bobsters_trains/decals/gwr_g
bobsters_trains/decals/gwr_w
bobsters_trains/decals/gwr_r
bobsters_trains/decals/intercity
bobsters_trains/decals/intercity_swallow
bobsters_trains/decals/mainline
bobsters_trains/decals/national_rail_logo
bobsters_trains/decals/network_rail
bobsters_trains/decals/ruston
bobsters_trains/decals/wdlr
Railfreight sectors
bobsters_trains/decals/railfreight/coal
bobsters_trains/decals/railfreight/coal_alt
bobsters_trains/decals/railfreight/construction
bobsters_trains/decals/railfreight/construction_alt
bobsters_trains/decals/railfreight/distribution
bobsters_trains/decals/railfreight/distribution_alt
bobsters_trains/decals/railfreight/general
bobsters_trains/decals/railfreight/general_alt
bobsters_trains/decals/railfreight/metals
bobsters_trains/decals/railfreight/metals_alt
bobsters_trains/decals/railfreight/petrolium
bobsters_trains/decals/railfreight/petrolium_alt
EU
bobsters_trains/decals/deutsche_bundesbahn
bobsters_trains/decals/deutsche_bundesbahn_alt
bobsters_trains/decals/deutsche_bundesbahn_early
bobsters_trains/decals/nederlandse_spoorwegen
bobsters_trains/decals/nederlandse_spoorwegen_winged_wheel
bobsters_trains/decals/sbb_cff_ffs
bobsters_trains/decals/sbb_cff_ffs_alt

US/CANADA
bobsters_trains/decals/alaska_rr
bobsters_trains/decals/amtrak_modern
bobsters_trains/decals/amtrak_old
bobsters_trains/decals/amtrak_old_b
bobsters_trains/decals/atsf
bobsters_trains/decals/baltimore_ohio
bobsters_trains/decals/bangor_aroostook
bobsters_trains/decals/bessemer
bobsters_trains/decals/bnsf
bobsters_trains/decals/burlington_northern
bobsters_trains/decals/burlington_route
bobsters_trains/decals/canadian_national
bobsters_trains/decals/canadian_national_cn
bobsters_trains/decals/canadian_national_railways
bobsters_trains/decals/chesapeake_western
bobsters_trains/decals/chessie_systems
bobsters_trains/decals/chicago_northwestern
bobsters_trains/decals/cnj
bobsters_trains/decals/conrail
bobsters_trains/decals/conrail_text
bobsters_trains/decals/cotton_belt_route
bobsters_trains/decals/cotton_belt_route_black
bobsters_trains/decals/csx
bobsters_trains/decals/csx_b
bobsters_trains/decals/grand_trunk_western_gt
bobsters_trains/decals/illinois_central
bobsters_trains/decals/illinois_central_diamond
bobsters_trains/decals/illinois_central_split
bobsters_trains/decals/metra
bobsters_trains/decals/milwaukee_road
bobsters_trains/decals/missouri_pacific
bobsters_trains/decals/missouri_pacific_eagle
bobsters_trains/decals/mkt
bobsters_trains/decals/new_haven
bobsters_trains/decals/new_haven_b
bobsters_trains/decals/nyc_early_blue
bobsters_trains/decals/nyc_early_nobg
bobsters_trains/decals/nyc_early_red
bobsters_trains/decals/nyc_late
bobsters_trains/decals/nickel_plate_road
bobsters_trains/decals/norfolk_southern
bobsters_trains/decals/norfolk_southern_nose
bobsters_trains/decals/panam
bobsters_trains/decals/prr_logo
bobsters_trains/decals/prr_logo_w
bobsters_trains/decals/rio_grande
bobsters_trains/decals/rio_grande_alt
bobsters_trains/decals/rio_grande_mainline
bobsters_trains/decals/southern_pacific
bobsters_trains/decals/southern_pacific_lines
bobsters_trains/decals/sps
bobsters_trains/decals/sps_nobg
bobsters_trains/decals/sps_b
bobsters_trains/decals/sps_b_nobg
bobsters_trains/decals/the_katy
bobsters_trains/decals/union_pacific
bobsters_trains/decals/union_pacific_flag
bobsters_trains/decals/union_pacific_wings
bobsters_trains/decals/western_pacific