Interoperability problems Comparison of train and tram tracks

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difference in form , profile of wheel , rail of train (left, blue) , tram (right, green).


at junctions of train tracks, gap in frog or switch rail wide. trams can accommodated.


the main problem train on tram rails relatively narrow width of frog , switch gaps , channels of groove rails designed accommodate narrow flanges of tram wheels . wider flanges of train wheels increase risk of derailment @ these points. on routes train carriages driven on tram tracks (as in past in parts of hague), wider grooves required compromise practical wide grooved girder rail available. larger structure gauge required done in los angeles , in vancouver elsewhere in north america. or limited structure gauge, , tight curves, on tram tracks prevent trains using tram tracks.


in north america groove have minimum of 2 ⁄8 in (54 mm) wide , extension, maximum distance between inside faces of guard flanges of grooved rails can no more 52 ⁄4 in (1,327.1 mm), see below.


quote:



5.3.2.1 design tolerances
design tolerances affect lateral displacement of body include following:

1. lateral tolerance between wheels , rails 2 types of flanges permitted on railroad wheels - narrow , wide. maximum lateral movement t1 possible new wheel set centered on in-gage track function of flange type , determined following formula: caution: use english units in formulas in recommended practice



t1 = .5[gt-(gw+2fn)]
= .59375” (15.081 mm) narrow-flange wheels
= .375 (9.53 mm) wide-flange wheels

where: gt = standard track gage @ point “5/8” (15.9 mm) below top of rail = 56.5 (1,435.1 mm)


gw = minimum gage of wheel set between backs of flanges = 53” (1,346.2 mm)


fn = minimum thickness of new wheel flange = 1.15625” (29.369 mm) narrow flange or = 1.375 (34.9 mm) wide flange



note: conversions not in original text , information only.

quoted apta pr-cs-rp-003-98 recommended practice developing clearance diagram passenger equipment 5.3.2.1 design tolerances (pdf). apta.com. american public transportation association. 1998-03-26. retrieved 2015-01-17. 








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