FIRST LETTER DESIGNATES BUILDER:

A- ALCO PRODUCTS.

B - BALDWIN-LIMA-HAMILTON CORPORATION.

E - ELECTRO-MOTIVE DIVISION OF GENERAL MOTORS CORPORATION.

F - FAIRBANKS, MORSE AND COMPANY.

G - GENERAL ELECTRIC COMPANY.

L - LIMA-HAMILTON CORPORATION.

SECOND LETTER (AND THIRD WHEN USED) DESIGNATES SERVICE:

F - FREIGHT.

H - FREIGHT WITH LOWER GEARING, PRIMARILY FOR HELPER SERVICE.

FP - NORMALLY FREIGHT, BUT EQUIPPED FOR USE IN PASSENGER SERVICE.

P - PASSENGER.

S - SWITCHING SERVICE.

FS - SWITCHING LOCOMOTIVES, BUT EQUIPPED USE IN FOR FREIGHT SERVICE.

PS - SWITCHING LOCOMOTIVES, BUT EQUIPPED FOR USE IN PASSENGER SERVICE.

NUMERALS INDICATE ENGINE HORSEPOWER IN NEAREST HUNDREDS:

4 - 380 OR 400 HORSEPOWER    

6 - 600 OR 660 HORSEPOWER

7 - 750 OR 800 HORSEPOWER

10 - 1000 HORSEPOWER

12 - 1200 HORSEPOWER

15 - 1500 HORSEPOWER

16 - 1600 HORSEPOWER

17 - 1750 HORSEPOWER

18 - 1800 HORSEPOWER

20 - 2000 HORSEPOWER

22 - 2250 HORSEPOWER

24 - 2400 HORSEPOWER

25 - 2500 HORSEPOWER

30 - 3000 HORSEPOWER

32 - 3200 HORSEPOWER

40 - 4000 HORSEPOWER

45 - 4500 HORSEPOWER

48 - 4800 HORSEPOWER

50 - 5000 HORSEPOWER

60 -6000 HORSEPOWER

64 - 6400 HORSEPOWER

FINAL LETTER, OR LETTERS, INDICATES SPECIAL FEATURES AS FOLLOWS:

(ALL SMALL LETTERS)

a - CHANGE IN ORIGINAL DESIGN.

m - MULTIPLE UNIT EQUIPPED - SWITCHERS.

s - STEAM GENERATOR EQUIPPED - SWITCHERS.

z - INDICATES MAJOR CHANGES.

I WOULD LIKE TO GIVE A BIG THANKS TO WITHERS PUBLISHING FOR ALLOWING ME TO USE THE INFORMATION OUT OF  THEIR PENNSYLVANIA RAILROAD DIESEL LOCOMOTIVE PICTORIAL BOOKS FOR THESE PAGES.

I TRY TO USE THE 8/1/57 ASSIGNMENT CHART BUT IN A COUPLE OF INSTANCES, I USE THE 9/1/60 ASSIGNMENT CHART.  I WILL BE ADDING MORE INFORMATION TO THE LISTS AS MORE BOOKS ARE PUBLISHED.  IF ANYONE HAS A COPY OF M.P. 229 FROM 1957 THAT WOULD BE WILLING TO PHOTOCOPY ME THE PAGES PLEASE EMAIL ME.