From a Mini-Wave Box or applicable T-Bone 2 x 2.
Leaders Box Circulate twice and 1/4 In as 
  Trailers Extend, Arm Turn 3/4, and Extend.
A Mini-Wave Box ends in a Mini-Wave Box.
|  From a R-H Mini-Wave Box: 
 | 
|  From a L-H Mini-Wave Box: 
 |   |  |   |  | before Box Transfer
 |  | after 
 | 
 |  From a T-Bone 2 x 2: 
 |   |  |   |  | before Box Transfer
 |  | after 
 | 
 | 
Notes:
- 
Split | Box Transfer was originally named Split Transfer The Column.
- 
At C3 and above, the term Single Transfer is often used instead.
    In today's terminology, Single Transfer is a better name for the call
    because it is more precise.
- 
An odd characteristic of Split | Box Transfer is that there are two
    names for the same 4-dancer movement.  The name 
    (Split versus Box) is dependent upon the formation from which the call is
    done.  This is a dumb idea.  We don't have formation-dependent names for
    other 4-dancer calls!  Wouldn't it be silly if we had two names for 
    Right & Left Thru (one name for when the call is done from Facing Lines, 
    and one name for when the call is done by the Centers)?  In our opinion, 
    it's better to have one name for the call 
    (preferably Single Transfer) than to have two different 
    names for the same call depending upon whether or not each Box of 4 does 
    the call.
- 
Trailers end on the same spot from which they started, 
    but turned 1/4 (as if they did a 1/4 Out).
- 
Only the original Leaders can Roll.
- 
From a Mini-Wave Box, everyone ends next to the same dancer that they
    started with, holding the same hand with which they started.
- 
The hardest part of Box | Split Transfer seems to be the
    Trailers Cast Off 3/4.  
    - 3/4 turns are easier if you think of them as
        "half then a quarter more".
- Leaders should make a wide arc for the Split Circulate Twice.  This
        gives the Trailers more space, and allows them to smoothly 
        execute the call.
- Trailers should Extend, do a "tight" and quick Arm Turn 3/4, and
        then Extend.  Often Split | Box Transfer breaks down because 
        the Trailers don't turn far enough.
 
- 
Formation awareness (being able to quickly identify your position
    and relative orientation within the formation) helps in  executing 
    Box | Split Transfer.  From Columns, you need to know to work in 
    each Box and to not cross the center of the set into the other Box.
- 
Split | Box Transfer rotates your Box by 90° (as if you did
    a Split | Box Counter Rotate 1/4 & Trade).
| What's the difference between Split and Box?
  Split is appropriate when starting from an 8-dancer
      formation (such as Parallel Waves or Columns) in which the call is
      done in each Box.  That is, the overall 2x4 formation is "split" into
      two 2x2 formations, and the call is done within each 2x2.
   Box is appropriate when the call is done from all other formations.
      For example: Centers Box Transfer; As Couples Box Transfer;
      All Eight Box Transfer.
   It is inappropriate for the caller to simply say "Box Transfer" from 
      Parallel Waves or Columns and expect just the Centers to do the call.
      The caller should be explicit and say "Centers Box Transfer".  Some callers
      correctly assume that "Split" means each side, but then incorrectly assume
      that "Box" means Centers.  From Parallel Waves, if a caller said 
      "Box Transfer", We'd expect the call to be done on each side, just like
      any other 4-dancer call. | 
  
Transfer The Column [A1] (Lee Kopman 1974):
 From Mini-Wave Columns.
  First Two dancers in the Column (#1 and #2) move forward in Single File 
  around the outside of the other Column until parallel with
  the Center Box and then individually Face In (to end as a Couple) as the 
  Last Two dancers (#3 and #4) Circulate (to form a Center Box) and Cast Off 3/4; 
  all Extend.
  Ends in Parallel Waves.
3 By 1 Transfer The Column [C2]:
 From Columns.  
  The First Three dancers Transfer (as a 3-dancer group 
  Trail Off , 
  then individually 1/4 In) as the #4 dancers Circulate 1 & 1/2 and Cast Off 3/4;
  Center 4 Extend The Tag as Others Step Ahead to end in Parallel 3 & 1 Lines.