VERSION 2
DEMOINIT
ORIG 8.000 0.000 0.000
STRAIGHT 1 DEMO 1
	E 1.883214 2.133372 270.000000
	E 31.050000 2.133333 90.000000
	END
CURVE 2 DEMO 1 29.473372 12.727335 7.625000
	E 37.081031 13.241282 356.135245
	E 33.769610 6.427894 235.706018
	END
REDRAW
RESET
MESSAGE
The <Join> command can also join straight and curved tracks (in either order).

We will enable Cornu easements

END

STEP
PARAMETER misc cmdEasement
PARAMETER easement val -1.0
BIGPAUSE
PARAMETER easement ok
COMMAND JoinTrack
MOUSE 1 34.167 6.917
MOUSE 2 34.167 6.917
MOUSE 4 34.167 6.917
MOUSE 1 23.750 2.167
MOUSE 2 23.750 2.167
MESSAGE
_________________________________________

A connecting cornu track is drawn between the two tracks.
END
STEP
MOUSE 3 23.750 2.083
MOUSE 3 19.417 2.000
MOUSE 4 19.417 2.000
MESSAGE
_________________________________________

Notice that the curved track is extended as the connection point moves past the End-Point.
END
STEP
MOUSE 1 34.167 6.917
MOUSE 2 34.167 6.917
MOUSE 3 19.167 2.000
MOUSE 3 10.917 2.333
BIGPAUSE
MOUSE 3 10.917 2.333
MOUSE 3 28.250 2.250
MESSAGE
_________________________________________

Here the connection makes the curved track wrap around.  This is not a useful shape, there is a discontinuity at the end. 
Adjusting the end point will fix it. 
END
STEP
MOUSE 3 28.250 2.250
MOUSE 4 28.250 2.250

MESSAGE
=========================================
END
REGRESSION START 10 - join curve and straight
STRAIGHT 1 0 0 0 0 DEMO 2
	E4 1.883214 2.133372 270.000000 0 0.0 0.0 0.0 0.0 0 0 0 0.000000 
	E4 31.050000 2.133333 90.000000 0 0.0 0.0 0.0 0.0 0 0 0 0.000000 
	END
CURVE 2 0 0 0 0 DEMO 2 29.473372 12.727335 0 7.625000 0 0.000000 0.000000
	E4 37.081031 13.241282 356.135245 0 0.0 0.0 0.0 0.0 0 0 0 0.000000 
	E4 33.769610 6.427894 235.706018 0 0.0 0.0 0.0 0.0 0 0 0 0.000000 
	END
REGRESSION END
STEP
CLEAR