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Frogs |
Monday, March 15, 2010
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A&K has numerous frog designs available in either Bolted Rigid or Manganese Cast Steel construction. Your A&K Rail and Track Specialists will assist you in selecting the proper design and construction to meet your traffic specifications. Frogs can be furnished to A.R.E.A. and A.M.C. specifications, or modifications can be made for your particular trackage. |
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How To Order Frogs
When ordering standard frogs, please specify the following:
1. Frog Design
2. Frog number or angle
3. Weight and section of rail
4. Overall length
(All measurements should be taken on the gauge lines).
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How To Determine The Number of a Frog
The frog number is the ratio of its length (measured on center line of frog) to its width, or the number of inches in length necessary for it to spread one inch in width. For example, a No. 3 frog spreads 1 in 3, a No. 5 spreads 1 in 5, a No. 8 spreads 1 in 8, etc.
To determine the number of a straight frog, measure across the frog point at place (A) where the distance between the gauge lines is an even number of inches: measure again where the distance (B) is an inch greater than at (A); the number of inches (C) between the two measured sections (A and B) is the number of the frog as shown above.
To the left is a table of frog numbers and their corresponding angles. |
| Frog No. |
Frog Angle |
| 5 |
11 -25'-16" |
| 6 |
9 -31'-38" |
| 8 |
7 -09'-10" |
| 9 |
6 -21'-35" |
| 10 |
5 -43'-29" |
| 11 |
5-12'-18" |
| 12 |
4 -46'-19" |
| 14 |
4 -05'-27" |
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Solid Manganese Steel Self Gaurded Frog |
A&K Solid Manganese Frogs
These one piece Solid Manganese Cast Steel Frogs are recommended by A&K's Rail and Track Specialists for location subject to heavy traffic and moderate speeds.
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| Frog Lengths |
| Group A Rails |
Frog
No. |
Total
Length |
Toe
Length |
Heel
Length |
Var.
Radius |
| 4 |
5'-1" |
15" |
3'-10" |
23" |
| 5 |
5'-6' |
18" |
4'-0" |
3'-2" |
| 6 |
6'-0" |
22" |
4'-2" |
4'-10" |
| 7" |
6'-10" |
2'-1" |
4'-9" |
6'-9 |
| 8 |
7'-10" |
2'-5" |
5'-5" |
8'-11" |
| 9 |
8'-10" |
2'-9" |
6'-1" |
11'-5" |
| 10 |
9'-9" |
3'-0" |
6'-9" |
14'-2" |
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| Group B Rails |
Total
Length |
Toe
Length |
Heel
Length |
Var.
Radius |
| 5'-1" |
15" |
3'-10" |
23" |
| 5'-5' |
17" |
4'-0" |
3'-2" |
| 5'-11" |
21" |
4'-2" |
4'-10" |
| 6'-7" |
2'-0" |
4'-7" |
6'-8" |
| 7'-7" |
2'-4" |
5'-3" |
8'-10" |
| 8'-5" |
2'-7" |
5'-10" |
11'-3" |
| 9'-4" |
2'-10" |
6'-6" |
14'-0" |
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| Group C Rails |
Frog
No. |
Total
Length |
Toe
Length |
Heel
Length |
Var.
Radius |
| 4 |
5'-1" |
15" |
3'-10" |
23" |
| 5 |
5'-5" |
17" |
4'-0" |
3'-2" |
| 6 |
5'-10" |
20" |
4'-2" |
4'-9" |
| 7 |
6'-3" |
23" |
4'-4" |
6'-8" |
| 8 |
7'-3" |
2'-3" |
5'-0" |
8'-9" |
| 9 |
8'-1" |
2'-6" |
5'-7" |
11'-2" |
| 10 |
8'-11" |
2'-9" |
6'-2" |
13'-11" |
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| Group D Rails |
Total
Length |
Toe
Length |
Heel
Length |
Var.
Radius |
| 5'-1" |
15" |
3'-10" |
23" |
| 5'-5' |
17" |
4'-0" |
3'-2" |
| 5'-10" |
20" |
4'-2" |
4'-9" |
| 6'-2" |
22" |
4'-4" |
6'-6" |
| 6'-11" |
2'-1" |
4'-10" |
8'-7" |
| 7'-9" |
2'-4" |
5'-5" |
11'-0" |
| 8'-7" |
2'-7" |
6'-0" |
13'-8" |
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| Group E Rails |
Frog
No. |
Total
Length |
Toe
Length |
Heel
Length |
Var.
Radius |
| 4 |
5'-11" |
2'-1" |
3'-10" |
23" |
| 5 |
6'-5" |
2'-1" |
4'-4" |
3'-3" |
| 6 |
7'-4" |
2'-11" |
4'-5" |
5'-0" |
| 7 |
8'-1 1/2" |
2'-11" |
5'-2 1/2" |
7'-0" |
| 8 |
8'-11" |
2'-11" |
6'-0" |
9'-2" |
| 9 |
9'-9" |
2'-11" |
6'-10" |
11'-6" |
| 10 |
11'-4 1/2" |
3'-9" |
7'-7 1/2" |
4'-8" |
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Quantity of Hook Twin Plates |
Frog
No. |
Type 1 Rails |
Type 2 Rails |
Type 3 Rails |
| Mark |
L23 |
L27 |
H23 |
H27 |
H31 |
H35 |
LR23 |
LR27 |
LR31 |
L23 |
L27 |
H23 |
H27 |
H31 |
H35 |
LR23 |
LR27 |
LR31 |
L23 |
L27 |
H23 |
H27 |
H31 |
H35 |
LR23 |
LR27 |
LR31 |
| 5 |
4 |
2 |
4 |
2 |
0 |
2 |
0 |
2 |
0 |
4 |
2 |
4 |
2 |
0 |
2 |
0 |
2 |
0 |
4 |
2 |
4 |
2 |
0 |
2 |
0 |
2 |
0 |
| 6 |
4 |
2 |
4 |
2 |
0 |
2 |
0 |
2 |
0 |
4 |
2 |
4 |
2 |
0 |
2 |
0 |
2 |
2 |
4 |
2 |
4 |
2 |
2 |
2 |
0 |
2 |
2 |
| 7 |
4 |
4 |
2 |
4 |
0 |
2 |
2 |
2 |
0 |
4 |
4 |
2 |
4 |
0 |
2 |
2 |
2 |
2 |
4 |
2 |
4 |
4 |
2 |
2 |
0 |
2 |
2 |
| 8 |
6 |
2 |
2 |
4 |
2 |
0 |
2 |
4 |
0 |
6 |
4 |
4 |
4 |
2 |
0 |
0 |
4 |
2 |
4 |
4 |
4 |
4 |
2 |
2 |
0 |
4 |
2 |
| 9 |
8 |
2 |
2 |
4 |
2 |
0 |
2 |
4 |
0 |
6 |
4 |
4 |
6 |
0 |
0 |
2 |
4 |
2 |
4 |
4 |
6 |
6 |
2 |
0 |
0 |
4 |
2 |
| 10 |
8 |
2 |
4 |
6 |
0 |
0 |
4 |
4 |
0 |
6 |
4 |
6 |
6 |
2 |
0 |
2 |
4 |
2 |
6 |
4 |
6 |
6 |
2 |
0 |
2 |
4 |
2 |
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A&K Bolted Rigid Frogs
This type of frog is used in yard and industrial tracks where the traffic is light on both sides of the frog.
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| Data for A.R.E.A. Plan No. 323-59 Frogs |
| Frog Number |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
A.R.E.A. Plan
Reference |
322-59 |
322-59 |
322-59 |
323-59 |
323-59 |
323-59 |
324-59 |
324-59 |
324-59 |
| Angle |
14º15' |
11º25'16" |
9º31'38" |
8º10'16" |
7º09'10" |
6º21'35" |
5º43'29" |
5º12'18" |
4º46'19" |
| Frog Length |
8'-0" |
9'-0" |
10'-0" |
12'-0" |
13'-0" |
16'-0" |
16'-6" |
18'-8 1/2" |
20'-4" |
| Toe Length |
3'-4" |
3'-6 1/2" |
3'-9" |
4'-8 1/2" |
5'-1" |
6'-4 1/2" |
6'-5" |
7'-0" |
7'-9 1/2" |
| Heel Length |
4'-8" |
5'-5 1/2" |
6'-3" |
7'-3 1/2" |
7'-11" |
9'-7 1/2" |
10'-1" |
11'-8 1/2" |
12'-6 1/2" |
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Rail Bound Manganese Steel Frogs for rails 112 lb. and heavier
This type of frog is used for heavy or high speed mainline service where the traffic is approximately equal on both sides of the frog. |
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| Copyright © 2007 A&K Railroad Materials, Inc. All rights reserved. |
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