YM Wholesome in the port of Rotterdam
Class overview
Builders	Hyundai Heavy Industries CSBC Corporation Imabari Shipbuilding
Operators	Yang Ming Marine Transport Corporation
In service	2015-present
Planned	20
Building	0
Completed	20
Active	20
General characteristics (HHI)
Type	Container ship
Tonnage	144,651 GT
Length	368 m (1,207 ft)
Beam	51 m (167 ft)
Draught	16.025 m (52.58 ft)
Capacity	14,080 TEU
General characteristics (CSBC)
Type	Container ship
Tonnage	145,136 GT
Length	368 m (1,207 ft)
Beam	51 m (167 ft)
Draught	16.025 m (52.58 ft)
Capacity	14,078 TEU to 14,198 TEU
General characteristics (Imabari)
Type	Container ship
Tonnage	151,451 GT
Length	366.4 m (1,202 ft)
Beam	51.2 m (168 ft)
Draught	15.5 m (51 ft)
Capacity	14,220 TEU

The W class is a series of 20 container ships operated by Yang Ming Marine Transport Corporation. The maximum theoretical capacity of the ships is between 14,078 and 14,200 TEU.^[1]

The order for the first 15 ships was announced in 2013. The ships would be chartered from Seaspan Corporation for a length of 10 years. Ten of the ships would be built by Hyundai Heavy Industries and the remaining five would be built by CSBC Corporation, Taiwan.^[2] The first ship was delivered in 2015.

In 2015 Yang Ming ordered another 5 container ships. This time the ships would be built by Imabari Shipbuilding and they would be chartered from Shoei Kisen Kaisha.^[3]