when did diesel locomotives appear

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
when did diesel locomotives appear	1.13	0.8	9168	43	34
when	1.51	0.1	4502	42	4
did	0.76	0.9	3459	49	3
diesel	1.61	0.4	2225	82	6
locomotives	0.74	0.2	7851	66	11
appear	0.2	0.4	5895	9	6

Keyword	CPC	PCC	Volume	Score
when did diesel locomotives appear	1.06	0.4	3608	76
history of diesel locomotives in america	2	1	5647	15
when was the first diesel locomotive built	1.12	0.3	9736	49
what was the first diesel locomotive	0.29	0.7	4029	18
when did diesel locomotives replace steam	0.89	0.1	3642	1
early diesel locomotives uk	1.07	0.5	9469	86
early diesel locomotives in usa	0.49	0.8	9511	33
when was the first diesel electric locomotive	1.75	1	488	53
diesel electric locomotive history	0.84	0.6	1791	26
first diesel train locomotive	1.08	0.6	7789	59
pictures of diesel locomotives	0.14	0.3	3272	9
first diesel locomotive in the world	0.36	0.1	4839	17
types of early diesel locomotives	1.17	0.3	859	46
first diesel locomotive in usa	0.27	0.6	6361	56
inventor of the diesel locomotive	1.02	0.8	5277	27
world's first diesel locomotive	0.44	0.3	4600	28
what was the first american diesel locomotive	0.66	0.3	5139	76
first diesel locomotive in america	1.27	0.1	2748	92