CALVERT CENTRAL RAILROAD
CONSTRUCTION SPECS AND STANDARDS
Jan. 11, 2009
CONSTRUCTION DETAILS

RAIL
Original Source: RealTrains.com
Rail Height: 0.891 inch  Length: 8 ft 10 in
New Source: Peter Nuskey
Rail Height: .850 inch  Length: 10 ft

TIES
1.5 x 2.5 inch (Treated 2x6 ripcut once)
Length: 13.75 inches
Switch tie lengths 16, 18, 20, 22, 24 inches

FASTENERS
#10 x 1 inch galvanized sheet metal screws  with shoulder

BALLAST
3/4 inch crushed stone

MINIMUM RADIUS
22 feet

CONSTRUCTION OF TRACK PANELS
Ties pre-drilled before installation
Tie spacing 4 inch centers
Rails staggered 12 inches at joints
GAUGES AND MEASUREMENTS

Track gauge: 7.5 to 7 5/8 in (190.5 to 193.67 mm)
Flangeway depth: 0.18701 in (4.75 mm)
Flangeway width - guardrails: 7.5 mm
Flangeway width - frog wingrails - 12.5 mm

Wheel Standards (IBLS)
Flange depth 0.18701 (4.75 mm)
B - Back to Back gauge  7.12 to 7.14 in (180.85 - 181.35 mm)
WC - Wheel Check gauge 7.281 in (184.94 mm)

Coupler height 4.38 in (111.25 mm)
SCALE CONVERSION TABLES
1:4.8 Scale
3 ft narrow gauge
Prototype
1:8 Scale 1:7.5 Scale
36 in gauge
56.5
.25
.5
.75
1
2
3
4
5
6
7
8
9
10
11
12
1.5
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
24
28
32
36
40
50
 in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
ft
 7.06
.03
.06
.09
.13
.25
.38
.5
.6
.75
.88
1.00
1.13
1.25
1.38
1.5
2.25
3.0
4.5
6.0
7.5
9.0
10.5
12.0
13.5
15
16.5
18
19.5
21
22.5
24
25.5
27
28.5
30
36
42
48
54
60
75		 in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in		 7.5
.05
.10
.16
.21
.42
.63
.83
1.04
1.25
1.46
1.67
1.88
2.08
2.29
2.50
3.75
5.0
7.5
10.0
12.5
15.0
17.5
20.0
22.5
25.0
27.5
30.0
32.5
35.0
37.5
40.0
42.5
45.0
47.5
50
60
70
80
90
100
125		 in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
7.53
.03
.07
.10
.13
.27
.40
.53
.67
.80
.93
1.07
1.20
1.33
1.47
1.60
2.40
3.20
4.80
6.40
8.0
9.6
11.2
12.8
14.4
16
17.6
19.2
20.8
22.4
24.0
25.6
27.2
28.8
30.4
32.0
38.4
44.8
51.2
57.6
64.0
80.0		 in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in
in