prr class builders model   build date  total produced wheel arrangement   service  power output
0        es6             sw         1937              12             b - b  switcher           NaN
1        es6            sw1  1942 - 1950              85             b - b  switcher           NaN
2       es10            nw2  1941 - 1948              32             b - b  switcher           NaN
3       es12      sw7 - sw9  1950 - 1953              84             b - b  switcher           NaN
4       es12         sw1200         1957              35             b - b  switcher           NaN
5       ef15      f3a , f7a  1947 - 1952             203             b - b   freight           NaN
6       ef15      f3b , f7b  1947 - 1952             107             b - b   freight           NaN
7      epf15           fp7a         1952              40             b - b      pass           NaN
8      epf15           fp7b         1952              14             b - b      pass           NaN
9       ep20            e7a  1945 - 1949              46         a1a - a1a      pass           NaN
10      ep20            e7b  1945 - 1949              14         a1a - a1a      pass           NaN
11      ep22            e8a  1950 - 1952              74         a1a - a1a      pass           NaN
12     ers15            gp7  1952 - 1953              66             b - b   freight           NaN
13   ers15ax            sd7         1953               2             b - b   freight           NaN
14     ers17            gp9  1955 - 1959             310             b - b   freight           NaN
15    ers17a            sd9  1957 - 1958              25             c - c   freight           NaN
16      ef22           gp30         1963              52             b - b   freight           NaN
17      ef25           gp35  1964 - 1965             119             b - b   freight           NaN
18     ef25a           sd35         1965              40             c - c   freight           NaN
19     ef30a           sd40         1966              65             c - c   freight           NaN
20      ef36           sd45         1966              65             c - c   freight           NaN
21     ef20a           gp38         1967               5             b - b   freight           NaN

Table as JSON:
{"prr class":{"0":"es6","1":"es6","2":"es10","3":"es12","4":"es12","5":"ef15","6":"ef15","7":"epf15","8":"epf15","9":"ep20","10":"ep20","11":"ep22","12":"ers15","13":"ers15ax","14":"ers17","15":"ers17a","16":"ef22","17":"ef25","18":"ef25a","19":"ef30a","20":"ef36","21":"ef20a"},"builders model":{"0":"sw","1":"sw1","2":"nw2","3":"sw7 - sw9","4":"sw1200","5":"f3a , f7a","6":"f3b , f7b","7":"fp7a","8":"fp7b","9":"e7a","10":"e7b","11":"e8a","12":"gp7","13":"sd7","14":"gp9","15":"sd9","16":"gp30","17":"gp35","18":"sd35","19":"sd40","20":"sd45","21":"gp38"},"build date":{"0":"1937","1":"1942 - 1950","2":"1941 - 1948","3":"1950 - 1953","4":"1957","5":"1947 - 1952","6":"1947 - 1952","7":"1952","8":"1952","9":"1945 - 1949","10":"1945 - 1949","11":"1950 - 1952","12":"1952 - 1953","13":"1953","14":"1955 - 1959","15":"1957 - 1958","16":"1963","17":"1964 - 1965","18":"1965","19":"1966","20":"1966","21":"1967"},"total produced":{"0":12,"1":85,"2":32,"3":84,"4":35,"5":203,"6":107,"7":40,"8":14,"9":46,"10":14,"11":74,"12":66,"13":2,"14":310,"15":25,"16":52,"17":119,"18":40,"19":65,"20":65,"21":5},"wheel arrangement":{"0":"b - b","1":"b - b","2":"b - b","3":"b - b","4":"b - b","5":"b - b","6":"b - b","7":"b - b","8":"b - b","9":"a1a - a1a","10":"a1a - a1a","11":"a1a - a1a","12":"b - b","13":"b - b","14":"b - b","15":"c - c","16":"b - b","17":"b - b","18":"c - c","19":"c - c","20":"c - c","21":"b - b"},"service":{"0":"switcher","1":"switcher","2":"switcher","3":"switcher","4":"switcher","5":"freight","6":"freight","7":"pass","8":"pass","9":"pass","10":"pass","11":"pass","12":"freight","13":"freight","14":"freight","15":"freight","16":"freight","17":"freight","18":"freight","19":"freight","20":"freight","21":"freight"},"power output":{"0":null,"1":null,"2":null,"3":null,"4":null,"5":null,"6":null,"7":null,"8":null,"9":null,"10":null,"11":null,"12":null,"13":null,"14":null,"15":null,"16":null,"17":null,"18":null,"19":null,"20":null,"21":null}}