initial check-in
diff --git a/progs/demos/geartrain.dat b/progs/demos/geartrain.dat
new file mode 100644
index 0000000..6b46745
--- /dev/null
+++ b/progs/demos/geartrain.dat
@@ -0,0 +1,119 @@
+BACKGROUND = 0.000 0.500 0.700
+
+ANAME = AXLE1
+ARADIUS = 1.000
+AAXIS = 2
+APOSITION = -7.000 0.000 0.000
+ACOLOR = 0.800 0.500 0.200
+ALENGTH = 6.000
+AMOTORED = 1
+AANGULARVELOCITY = 2.000
+ADIRECTION = 1
+
+ANAME = AXLE2
+ARADIUS = 1.000
+AAXIS = 2
+APOSITION = -3.000 0.000 0.000
+ACOLOR = 0.800 0.500 0.200
+ALENGTH = 12.000
+AMOTORED = 0
+
+ANAME = AXLE3
+ARADIUS = 1.000
+AAXIS = 2
+APOSITION = 1.000 0.000 0.000
+ACOLOR = 0.800 0.500 0.200
+ALENGTH = 6.000
+AMOTORED = 0
+
+ANAME = AXLE4
+ARADIUS = 1.000
+AAXIS = 2
+APOSITION = 8.000 0.000 0.000
+ACOLOR = 0.800 0.500 0.200
+ALENGTH = 18.000
+AMOTORED = 0
+
+ANAME = AXLE5
+ARADIUS = 1.000
+AAXIS = 1
+APOSITION = 8.000 -8.200 -7.400
+ACOLOR = 0.800 0.500 0.200
+ALENGTH = 12.000
+AMOTORED = 0
+
+GNAME = GEAR1
+GTYPE = NORMAL
+GRADIUS = 2.200
+GWIDTH = 3.000
+GTEETH = 40
+GTOOTHDEPTH = 0.500
+GCOLOR = 0.500 0.500 0.500
+GAXLE = AXLE1
+GPOSITION = 0.000
+
+GNAME = GEAR2
+GTYPE = NORMAL
+GRADIUS = 2.200
+GWIDTH = 3.000
+GTEETH = 30
+GTOOTHDEPTH = 0.500
+GCOLOR = 0.500 0.500 0.500
+GAXLE = AXLE2
+GPOSITION = 0.000
+
+GNAME = GEAR3
+GTYPE = NORMAL
+GRADIUS = 2.200
+GWIDTH = 3.000
+GTEETH = 20
+GTOOTHDEPTH = 0.500
+GCOLOR = 0.500 0.500 0.500
+GAXLE = AXLE3
+GPOSITION = 0.000
+
+GNAME = GEAR4
+GTYPE = NORMAL
+GRADIUS = 1.700
+GWIDTH = 1.000
+GTEETH = 20
+GTOOTHDEPTH = 0.500
+GCOLOR = 0.500 0.500 0.500
+GAXLE = AXLE2
+GPOSITION = 5.000
+
+GNAME = GEAR5
+GTYPE = NORMAL
+GRADIUS = 3.000
+GWIDTH = 1.000
+GTEETH = 20
+GTOOTHDEPTH = 0.500
+GCOLOR = 0.500 0.500 0.500
+GAXLE = AXLE4
+GPOSITION = 5.000
+
+GNAME = GEAR6
+GTYPE = BEVEL
+GFACE = 0
+GRADIUS = 4.000
+GWIDTH = 1.000
+GTEETH = 20
+GTOOTHDEPTH = 1.700
+GCOLOR = 0.500 0.500 0.500
+GAXLE = AXLE4
+GPOSITION = -4.000
+
+GNAME = GEAR7
+GTYPE = BEVEL
+GFACE = 0
+GRADIUS = 4.000
+GWIDTH = 1.000
+GTEETH = 20
+GTOOTHDEPTH = 1.700
+GCOLOR = 0.500 0.500 0.500
+GAXLE = AXLE5
+GPOSITION = 5.000
+
+BELTNAME = BELT1
+GEAR1NAME = GEAR5
+GEAR2NAME = GEAR4