- switch (FEAT_ROADVEHS, SELF, switch_e4_style,
- max((date_of_last_service - random_bits*3)/365 - 2, build_year)
- ){ //style by build year
- 0..1979: spritegroup_d1_tram_04;
- 1980..1984: spritegroup_d2_tram_04;
- 1985..1989: spritegroup_d3_tram_04;
- 1990..1997: spritegroup_d4_tram_04;
- 1998..2004: spritegroup_d5_tram_04;
- 2005..2014: spritegroup_d6_tram_04;
- default: spritegroup_d7_tram_04;
- }