@josephmartinengineer: Train wheels can't steer… so how does a train take a curve? 🚂 Both wheels sit on one solid steel axle, so they always spin together. But through a quarter-turn curve the outside rail is almost 8 ft (2.4 m) longer, and a train has no differential. The flanges are only a backup. The real trick: every train wheel is a cone, wider on the inside. In a curve the axle drifts a fraction of an inch outward, so the outer wheel rolls on a bigger circle and the axle steers itself. Curve too tight? The wheels have to slip, and that's the screech you hear. Did you know trains turn on two cones? 👇 (Cone shape exaggerated in the diagrams.) #trains #railroad #engineering #howitworks #physics

Joseph Martin Engineer
Joseph Martin Engineer
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Friday 02 October 2026 00:01:55 GMT
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ickstopher
Ickstopher :
Not a train professor here but would it help to have separate axles?
2026-10-03 01:28:46
2
jackson0713
jackson0713 :
They figured all this out with ink quill and paper in the 1800s. Baffles my mind
2026-10-02 22:55:57
146
t.0u812
t. :
train cars sit on whats called a kingpin,the whole assembly turns.
2026-10-02 16:36:36
6
jacobbenson532
Bobby :
thats so un true! been fixing railcars for 17 years the are not cone shaped.
2026-10-03 11:31:19
1
yeti.cars
Noah :
This was too tight
2026-10-02 13:54:56
51
popeyeontherr
Popeye on the RR :
Fun fact. The width of the distance between the rails is the same distance between covered wagon wheels were. When the railroad came to be, there were no gauges or measurements so they based on how wide wagon wheels were.
2026-10-04 01:31:11
6
teejaykeefe
Tj :
The axles are attached to trucks which swivel
2026-10-02 17:30:34
2
bankofchords
Anti-Hero :
They should make the train wheels out of a softer and lighter material now that I think about it, so that it won't be dangerous for people.
2026-10-04 15:23:29
1
noahbooth36
Noah Booth :
This is why trains don't have power steering.
2026-10-05 15:44:21
2
nevermoors13
Nevermoors :
People figure out some cool sh!t.
2026-10-02 17:51:59
26
c10sickness
C10 sickness :
The elevation of the curve also plays huge part in how they go around corners.
2026-10-02 23:41:07
1
jonr619
jonr :
Why not just use the steering wheel? Make sure there’s enough air in the tires too
2026-10-02 20:53:33
0
wesleymartinez84
Wesley Martinez121 :
thats why its important that gage is right
2026-10-02 12:54:53
2
jamessackmaster
Happy Sack :
I love the info. Thank you.🇺🇸🇺🇸🇺🇸👍
2026-10-06 13:52:55
1
jimtheplumber
jimtheplumber :
Boom, did not know that, and I like trains and I’ve looked into trains and that’s the first I’ve heard of it
2026-10-04 00:27:26
2
user30695041249465
user30695041249465 :
Engineers don’t call that “wobble hunting” it’s called truck hunting
2026-10-04 01:05:01
2
autisticweston
Weston :
My gf will say I like this because I’m autistic but I say I like it because it’s cool mechanics
2026-10-02 22:58:13
7
987654321poiuytrewq0
user2055237492936 :
Excellent idea applied practically resulting in successful rolling
2026-10-02 08:03:39
0
machughes6
Mac Hughes :
🤔 the trucks are able to pivot in curves. This is terrible information
2026-10-03 12:13:34
0
anthony.holubec
Anthony Holubec :
I've heard this before but still think it's cool.
2026-10-04 03:47:47
0
charlesday26
Charles Day :
We call it the Aztec Death Screech
2026-10-05 17:20:32
0
zacherymb
ZacheryMB :
Bart trains in the SF Bay Area screech like hell. They take those curves great though and hit 80 in some spots.
2026-10-04 12:20:30
0
pat.dice
Pat Dice :
they sit on a pivot
2026-10-12 21:00:38
0
rudyherrera76
Rudy Herrera :
curve elevation is the trick🤙🏻💯
2026-10-16 17:57:39
0
rodmil66
Rod :
Great info
2026-10-02 13:09:53
0
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