> Trains ain=E2=80=99t so easy to run like it seems. :-) > And often, what with cars would be considered a fairly normal event, like > bumping at low speed into another car, with trains it would be considered > as an unacceptable risk... Today I ran across the specifications for the Denver light rail system: https://nacto.org/docs/usdg/rtd_light_rail_design_criteria_regional_trans_d= istrict.pdf There's a LOT that goes into the design! Harold --=20 FCC Rules Updated Daily at http://www.hallikainen.com Not sent from an iPhone. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .