Somerville sheets with Boston and Maine RR Trackage 
Most: Roughly in order, West to East
B&M Mainline: Roughly in order, North to South

1900 Maps 
    ex-Fitchburg Main
	25
	26
	37
	38
	40
	55
	56
	74
	76
	77
	89-90
	107-108
	111
	112
	113
	114
	
    ex B&L main
	?
	39
	35-33-36
	34
	45
	46
	61
	62
	83
	85
	84-86
	94-95
	99
	110
	112
	114
	
    B&M main
	98

    Central Mass Br.
	6
	11
	12-9
	15
	18
	21
	22
	31-33
	34
	45

1934 and 1950 Maps 
 Vol 1
    ex-Fitchburg Main
	10
	11
	13-3
	14-4
	20-5
	21
	22
	8
	9
    B&M main
	71
	72
	64
    ex B&L main
	33
	34
	35
	36
	37
	38
	32
	7
 	8
	9
    Misc trackage around Somerville yards
	41
	73
 Vol 2
    ex-Fitchburg Main
	261
	262
	263
	264
	265
    ex B&L main
	213
	233
	234
	235-236
	241
	242
	243
	249
	250
    Central Mass Br.
	209
	210
	201
	202
	231
	239
	240
	241
	242
	243
	249