Wooden toy train

1asset toy_train "Wooden toy train" complexity=3
2// a blue wooden toy train four squares long, engine at +x, built for the top view: an engine with a
3// banded boiler, a red funnel and a brass dome in front of a little cab, then three open wagons
4// carrying chunky painted blocks, all on bright red wheels with yellow hubs. Under 18 cm tall
5let woodC = cobalt
6let wheelC = cherry
7let hubC = sunflower
8let ironC = iron
9 
10// four chassis blocks, one per square; red wheels on both sides
11box chassis x4 at=(0, .034, 0) row=(.3, 0, 0) size=(.25, .05, .17) round=.016 bev=1 color=woodC
12cyl wheel x8 at=(0, .04, .084) row=(.15, 0, 0) rot=(90, 0, 0) h=.03 r=.04 cap=hubC color=wheelC segs=12
13cyl wheelb x8 at=(0, .04, -.084) row=(.15, 0, 0) rot=(-90, 0, 0) h=.03 r=.04 cap=hubC color=wheelC segs=12
14rod coupling x3 at=(-.03, .055, 0) row=(.3, 0, 0) to=(.06, 0, 0) r=.014 sides=6 color=ironC
15 
16// the engine: a banded boiler with a smokebox front, a red funnel, a brass dome and a cab with a roof
17cyl boiler at=(.385, .1, 0) roll=-90 h=.18 r=.058 round=.012 bands=[.3:hubC .36:woodC .84:ironC] cap=ironC color=woodC segs=16
18cyl funnel on=boiler at=(-.05, .142, 0) roll=90 h=.022 r=.022 r2=.03 cap=ironC color=wheelC segs=12
19ball dome on=boiler at=(-.052, .072, 0) roll=90 half r=(.026, .018, .026) color=hubC segs=12 rings=5
20box cab at=(.352, .074, 0) size=(.092, .08, .158) round=.016 bands=[.45:glassDark .8:woodC] color=woodC
21box roof on=cab at=(-.004, .08, 0) size=(.118, .02, .186) round=.008 color=wheelC
22 
23// three open wagons of painted blocks
24box bed x3 at=(-.15, .084, 0) row=(.3, 0, 0) size=(.23, .02, .15) round=.008 color=woodC*1.14
25box block1 at=(.11, .104, -.02) yaw=14 size=(.07, .066, .07) round=.012 color=sunflower
26cyl block2 at=(.2, .104, .03) h=.066 r=.034 round=.008 color=wheelC segs=12
27ball block3 at=(-.19, .104, .028) half r=(.048, .05, .048) color=lime segs=14 rings=6
28box block4 at=(-.105, .104, -.03) yaw=-10 size=(.064, .062, .064) round=.012 color=tangerine
29cyl block5 at=(-.5, .104, .03) h=.066 r=.032 round=.008 color=sky segs=12
30box block6 at=(-.405, .104, -.03) yaw=20 size=(.07, .056, .07) round=.012 color=wheelC
31