Table:
text: Northern Pacific Railway locomotives
2-8-2
2-8-2
Class_ Wheel_arrangement Fleet_numbers Manufacturer Year_made Quantity_made Quantity_preserved Years_retired
2-8-2 — oOOOOo — Mikado 2-8-2 — oOOOOo — Mikado 2-8-2 — oOOOOo — Mikado 2-8-2 — oOOOOo — Mikado 2-8-2 — oOOOOo — Mikado 2-8-2 — oOOOOo — Mikado 2-8-2 — oOOOOo — Mikado 2-8-2 — oOOOOo — Mikado
W 2-8-2 1500–1659 Alco ( Brooks ) 1904–1907 160 0 1930–1959
W-1 2-8-2 1660–1699 Alco ( Schen. ) 1910 40 0 1925–1958
W-2 2-8-2 1900–1919 Alco ( Brooks ) 1904–1905 20 0 1930–1958
W-3 2-8-2 1700–1834 Alco ( Brooks ) 1913–1920 135 1 1926–1960
W-4 2-8-2 2500–2505 NP ( Brainerd Shops ) 1919 (rebuilt) 6 0 1955–1958
W-5 2-8-2 1835–1859 Alco ( Schen. ) 1923 25 0 1952–1960

Question: From the list of Northern Pacific Railway locomotives, which class had a count of 20 out of 2 8 2 ?