Lowell sheets with Boston and Maine RR Trackage 
Mainline - Roughly in order, North to South
Other - not much order
 
1892 Maps 
Mainline
 59 (North Chelmsford)
 62
 31
 30
 28
 35
 56
 55
 57
 54
 53
 52
Switching districts
 63
 51-45-46-47
 58
 8-9
 40
 37-38
 27-29
 19-20-21-22-23-24-25
 10-11-12-13-14
 66-67 (North Billerica)
 67 (North Wilmington)
 68 (Tewksbury)
 68 (Westford, Forge Village)

 
1907 Maps 
 Vol 1
    Mainline
	73-74-75-80-82 (North Chelmsford)
	72
 	63
	61
	82
	57-2
	55
	14
	13-6
	17
	12
	20
	27
	28
	29
	30
	36
	
    Other 
	9
	11
	32?-33?-34?
	35-36-37?-38-39?
 Vol 2
    Mainline
	139
	140
	142
	143(?)
	
    Other 
	95-96-97-98-99
 	100-103-104-105-106-107-108-109
	110-111-112-113-114-117
	125-126-127-128
	135-136-137-138-139
	141
	146 (Tewkesbury, North Wilmington)
	164-166 (North Billerica)
	166 (Forge Village)
	167-168 (Wigginville/Tewkesbury)
	169 (West Chelmsford, Billerica)
	170 (Billerica)
	172 (Tewkesbury)
	175 (Billerica Center)

1950 Maps 
 Vol 1
    Mainline
	73-74-75-80-82 (North Chelmsford)
	72
	90
	86
 	63
	61
	82
	2 (57 - tracks obscured/removed?)
	(55 - tracks obscured/removed?)
	14
	13-6
	17
	12
	20
	27
	28
	29
	30
	36
	
    Other 
	9
	11-16
	32?-33?-34? (Are Tanner St. tracks B&M or NYNH&H?)
	35-36-37?-38-39?
 Vol 2
    Mainline
	139
	140
	142
	143(?)
	172 (Tewkesbury)
	
    Other 
	95-96-97-98-99
 	100-103-104-105-106-107-108-109
	110-111-112-113-114-117
	125-126-127-128
	135-136-137-138-139
	141
	146 (Tewkesbury, North Wilmington)
	156 (Graniteville/Westford)
	166 (North Billerica)
	166 (Forge Village)
	167-168 (Wigginville/Tewkesbury)
	169 (Billerica)
	170 (Billerica - B&M Shops!)
	175 (Billerica Center)
 
 
1952 Maps 
 Vol 1
    Mainline
	73-74-80-82-91 (North Chelmsford)
	80
	90
	86
 	63
	61
	82
	2 
	14
	13-6
	17
	12
	20
	27
	28
	29
	30
	36
	
    Other 
	11-16
	32?-33?-34?
	35-36-38-39?
 Vol 2
    Mainline
	139
	140
	142
	172 (Tewkesbury)
	
    Other 
	96-97-98-99
 	100-103-104-105-106-107-108
	110-111-112-113
	125-126-127-128
	135-136-137-138-139
	141
	146 (Tewkesbury, North Wilmington)
	156 (Graniteville/Westford)
	166 (North Billerica)
	166 (Forge Village)
	167-168 (Wigginville/Tewkesbury)
	169 (Billerica)
	170 (Billerica - B&M Shops!)
	175 (Billerica Center)