### - a -

- ADMIN_AUTHORISATION_TIMEOUT : network_admin.cpp
- ADVERTISE_NORMAL_INTERVAL : network_udp.cpp
- ADVERTISE_RETRY_INTERVAL : network_udp.cpp
- ADVERTISE_RETRY_TIMES : network_udp.cpp
- AIRPORT_CLOSED_block : airport.h
- ALL_GROUP : group_type.h
- AllowedPPPonPCP : elrail_data.h
- ANIM_STATUS_LOOPING : newgrf_animation_type.h
- ANIM_STATUS_NO_ANIMATION : newgrf_animation_type.h
- ANIM_STATUS_NON_LOOPING : newgrf_animation_type.h
- ANIMCURSOR_BUILDSIGNALS : sprites.h
- ANIMCURSOR_DEMOLISH : sprites.h
- ANIMCURSOR_FLAG : sprites.h
- ANIMCURSOR_LOWERLAND : sprites.h
- ANIMCURSOR_PICKSTATION : sprites.h
- ANIMCURSOR_RAISELAND : sprites.h
- ASCII_LETTERSTART : fontcache.cpp
- AYSTAR_INVALID_NODE : aystar.h