>Even if you had the same track gauge and power supply (which you haven't)
>you'd run into a hell of a lot of problems with curvature and pointwork.
>As others have pointed out, tram wheel profiles are much finer than those
>on railways. In other words trams would tend to fall off quite often at
>normal operating speeds, particularly where curves and pointwork were
>encountered.
Although this doesn't happen in Karlsruhe, Duesseldorf or Manchester,
where trams regularly run on rail tracks - and in Karlsruhe share tracks with
mainline rail services...
*Philip*