Table:
text: List of largest locomotives
List
List
name_ railway series maker dates drive wheel_arrangement weight power_ notes_
EMD DDA40X Union Pacific 6900-6947 Electro-Motive Division of General Motors 1969–71 Diesel-electric D-D 244 t 6,600 horsepower (4,922 kW) One operational, several in museums; largest operational single-unit diesel locomotive and the most powerful
SJ Dm3 Malmbanan  ASEA 1953–71 Electric 1`D+D+D1` 273 t 9,655 horsepower (7,200 kW) Highest continuous tractive effort when built, most powerful locomotive using jackshafts
DB Class 103    1970–73 Electric Co`Co` 114 t 9,977 horsepower (7,440 kW) 
060-EA Romanian Railways(CFR) 001-1000 Electroputere Craiova 1970-91 Electric Co`Co` 120 t 6,839 horsepower (5,100 kW) Most powerful locomotive in 1970s; highest continuous tractive effort
060-EA Softronic Phoenix version Romanian Railways (CFR) and Hungarian State Railways ( MÁV ) 001, 2001-2004 Softronic Craiova 2009–present Electric Co`Co` 120 t 8,851 horsepower (6,600 kW) Most powerful locomotive with highest continuous tractive effort

text: List of largest locomotives
List
List
name_ railway series maker dates drive wheel_arrangement weight power_ notes_
Big Boy Union Pacific X4000-X4024 ALCO 1941-–44 Steam 4-8-8-4 548 t 6,290 horsepower (4,690 kW) Several on static display. , No. 4014 is to be moved from Pomona, Calif., to Cheyenne, Wyo. for restoration.
XA Triplex Virginian Railway 700 Baldwin 1916 Steam 2-8-8-8-4 383 t N/A, Tractive Effort: 199,560 lb simple; 166,600 lb compound Rebuilt into separate locomotives
Challenger Union Pacific 3985 ALCO 1936–43 Steam 4-6-6-4 485 t 6,200 horsepower (4,623 kW) Operates in excursion service; largest operational steam locomotive in 2007
GTEL 8500 `Big Blow` Union Pacific 1-30 (control cab), 1B-30B (turbine unit) General Electric 1958–61 Gas turbine-electric C-C+C-C 425 t 8,469 horsepower (6,315 kW) Over 10,000 hp at lower altitude and ambient temperatures. Two preserved in museums. Most powerful internal combustion locomotive built.

Question: What is the difference in weight between the 060 ea and the Challenger on the largest locomotives?