Irwin Car and Equipment

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Locomotive Tractive Effort Chart

Wt. Locomotive in tons	1 1/2	2	2 1/2	3	3 1/2	4	4 1/2	5	6	8	10	15	20
T.E. LBS.	750	1000	1250	1500	1750	2000	2250	2500	3000	4000	5000	7500	10000

Grade
0% Gross Train Load	25	33.3	51.6	50	58.3	66.6	75	83.3	100	133	167	250.5	330
0% Trailing Load	23.5	31.3	49.1	47	54.8	62.6	70.5	78.3	94	125	157	235.5	310

1% Gross Train Load	15	20	25	30	35	40	45	50	60	80	100	150	200
1% Trailing Load	13.5	18	22.5	27	31.5	36	40.5	45	54	72	90	135	180

2% Gross Train Load	10.7	14.3	17.9	21.4	25	28.6	32.1	35.7	42.8	57.1	71.4	107	142.8
2% Trailing Load	9.2	12.3	15.4	18.4	21.5	24.6	27.6	30.7	36.8	49.1	61.4	92	122.8

3% Gross Train Load	8.3	11.1	13.9	16.7	19.5	22.2	25	27.8	33.3	44.4	55.5	83.3	111
3% Trailing Load	6.8	9.1	11.4	13.7	16	18.2	20.5	22.8	27.3	36.4	45.5	68.3	91

4% Gross Train Load	6.8	9.1	11.4	13.7	16	18.2	20.5	22.8	27.3	36.4	45.5	68.3	91
4% Trailing Load	5.3	7.1	8.9	10.6	12.4	14.2	16	17.7	21.3	28.4	35.5	53.3	71

5% Gross Train Load	5.7	7.7	9.6	11.5	13.5	15.4	17.3	19.2	23.1	30.8	38.5	57.7	77
5% Trailing Load	4.2	5.7	7.1	8.5	10	11.4	12.8	14.2	17.1	22.8	28.5	42.7	57

6% Gross Train Load	5	6.6	8.3	10	11.6	13.3	15	16.6	20	26.6	33.3	49.9	66.5
6% Trailing Load	3.5	4.6	5.8	7	8.1	9.3	10.5	11.6	14	18.6	23.3	34.9	46.5

7% Gross Train Load	4.4	5.9	7.3	8.8	10.3	11.7	13.2	14.7	17.6	23.5	29.4	44	58.8
7% Trailing Load	2.9	3.9	4.8	5.8	6.7	7.7	8.7	9.7	11.6	15.5	19.4	29	38.3

8% Gross Train Load	4	5.2	6.6	7.9	9.2	10.5	11.8	13.1	15.8	21	26.3	39.5	52.5
8% Trailing Load	2.5	3.2	4.1	4.9	5.7	6.5	7.3	8.1	9.8	13	16.3	24.5	32.5

9% Gross Train Load	3.6	4.8	6	7.1	8.3	9.5	10.7	11.9	14.3	19	23.8	35.7	47.5
9% Trailing Load	2.1	2.8	3.5	4.1	4.8	5.5	6.2	6.9	8.3	11	13.8	20.7	27.5

10% Gross Train Load	3.2	4.3	5.4	6.5	7.6	8.7	9.8	10.9	13	17.4	21.7	32.6	43.4
10% Trailing Load	1.7	2.3	2.9	3.5	4.1	4.7	5.3	5.9	7	9.4	11.7	17.6	23.4