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Clearance

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  • Member since
    August 2003
  • From: SW Missouri
  • 35 posts
Clearance
Posted by steel on Saturday, August 2, 2003 7:11 PM
What is the min. distance from the top of the rail to the bottom of an overhead structure (Bridge, tunnel, etc.)?
  • Member since
    August 2003
  • From: SW Missouri
  • 35 posts
Clearance
Posted by steel on Saturday, August 2, 2003 7:11 PM
What is the min. distance from the top of the rail to the bottom of an overhead structure (Bridge, tunnel, etc.)?
  • Member since
    June 2001
  • From: Anderson Indiana
  • 1,268 posts
Posted by rogerhensley on Sunday, August 3, 2003 9:33 AM
I can't answer that exactly as it depends upon which AAR car Plate you are using. The Plate diagrams show the maximum height that a rail car can be for certain clearances.

The 1948 AAR Plate B was 15' 1"
Plate E - 15' 8"
Plate F - 17'
Plate H - 20' 2"

So you can see that you would expect the structure to be higher than that. I believe that the overhead wire clearances on the NEC is about 21'.

I'm sure that someone else will have a more definitive answer than this.

Roger Hensley
= ECI Railroad - http://madisonrails.railfan.net/eci/eci_new.html =
= Railroads of Madison County - http://madisonrails.railfan.net/

  • Member since
    June 2001
  • From: Anderson Indiana
  • 1,268 posts
Posted by rogerhensley on Sunday, August 3, 2003 9:33 AM
I can't answer that exactly as it depends upon which AAR car Plate you are using. The Plate diagrams show the maximum height that a rail car can be for certain clearances.

The 1948 AAR Plate B was 15' 1"
Plate E - 15' 8"
Plate F - 17'
Plate H - 20' 2"

So you can see that you would expect the structure to be higher than that. I believe that the overhead wire clearances on the NEC is about 21'.

I'm sure that someone else will have a more definitive answer than this.

Roger Hensley
= ECI Railroad - http://madisonrails.railfan.net/eci/eci_new.html =
= Railroads of Madison County - http://madisonrails.railfan.net/

  • Member since
    June 2001
  • From: Anderson Indiana
  • 1,268 posts
Posted by rogerhensley on Sunday, August 3, 2003 9:55 AM
Duhh! It just dawned on me that you might want to know about clearances for your modeling. Take a look at:

Standard S-7 Clearances and the NMRA Gauge
at
http://www.nmra.org/standards/gauge.html

Roger Hensley
= ECI Railroad - http://madisonrails.railfan.net/eci/eci_new.html =
= Railroads of Madison County - http://madisonrails.railfan.net/

  • Member since
    June 2001
  • From: Anderson Indiana
  • 1,268 posts
Posted by rogerhensley on Sunday, August 3, 2003 9:55 AM
Duhh! It just dawned on me that you might want to know about clearances for your modeling. Take a look at:

Standard S-7 Clearances and the NMRA Gauge
at
http://www.nmra.org/standards/gauge.html

Roger Hensley
= ECI Railroad - http://madisonrails.railfan.net/eci/eci_new.html =
= Railroads of Madison County - http://madisonrails.railfan.net/

  • Member since
    August 2003
  • From: SW Missouri
  • 35 posts
Posted by steel on Sunday, August 3, 2003 10:16 PM
Thanks Roger, that is exactly what I was looking for!!
  • Member since
    August 2003
  • From: SW Missouri
  • 35 posts
Posted by steel on Sunday, August 3, 2003 10:16 PM
Thanks Roger, that is exactly what I was looking for!!
  • Member since
    October 2012
  • 527 posts
Posted by eastcoast on Sunday, October 26, 2003 11:08 AM
hey steel,
I am experimenting with the clearances of the east coast. In my modelling , I found that real world measure of 3 to 4 inches is pushing the issue but makes a great conversation piece for viewers who doubt that the cars will clear my bridges. Hope you read my reply.
ken_ecr
  • Member since
    October 2012
  • 527 posts
Posted by eastcoast on Sunday, October 26, 2003 11:08 AM
hey steel,
I am experimenting with the clearances of the east coast. In my modelling , I found that real world measure of 3 to 4 inches is pushing the issue but makes a great conversation piece for viewers who doubt that the cars will clear my bridges. Hope you read my reply.
ken_ecr
  • Member since
    September 2003
  • From: California - moved to North Carolina 2018
  • 4,387 posts
Posted by DSchmitt on Wednesday, October 29, 2003 9:48 PM
Actual Prototype clearances vary. Easten RR send to have more clearance restrictions than western RR mainly because the were constructed earlier. In the 1930's there was resistance to increasing the height of the standard box car because many eastern RR would not be able to handle taller cars on some of their lines. I read somewhere that one of the reasons for the B&O wagon top design was a taller car that could still get through the tunnels.

An interesting model operation would be to have a line with restricted clearance and a round about route to bypass the area.

I tried to sell my two cents worth, but no one would give me a plug nickel for it.

I don't have a leg to stand on.

  • Member since
    September 2003
  • From: California - moved to North Carolina 2018
  • 4,387 posts
Posted by DSchmitt on Wednesday, October 29, 2003 9:48 PM
Actual Prototype clearances vary. Easten RR send to have more clearance restrictions than western RR mainly because the were constructed earlier. In the 1930's there was resistance to increasing the height of the standard box car because many eastern RR would not be able to handle taller cars on some of their lines. I read somewhere that one of the reasons for the B&O wagon top design was a taller car that could still get through the tunnels.

An interesting model operation would be to have a line with restricted clearance and a round about route to bypass the area.

I tried to sell my two cents worth, but no one would give me a plug nickel for it.

I don't have a leg to stand on.

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