Change the Track with controlling Speed

[wali ahmed]

Hello,
             Jake  i would like to know that how a track can be change from Track A to Track B.
i already have Connected  Track A point to Track B point.
                 
                    For Example :- for changing the track we need to click toggle after clicking toggle and if we are changing speed its going on Track A as previous position

how can i change the Track by controlling speed .I am using 12_Train Scene.

                                         

Thanks much
wali Ahmed.