  The controlled creation of dark-bright (DB) soliton trains in multi-component
Bose-Einstein condensates (BECs) is a topic of ongoing interest. In this work
we generalize earlier findings on the creation of dark soliton trains in
single-component BECs [A. Romero-Ros et al., Phys. Rev. A 103, 023329 (2021)]
to two-component BECs. By choosing suitable filled box-type initial
configurations (FBTCs) and solving the direct scattering problem for the
defocusing vector nonlinear Schr\"odinger equation with nonzero boundary
conditions we obtain analytical expressions for the DB soliton solutions
produced by a general FBTC. It is found that the size of the initial box and
the amount of filling directly affects the number, size, and velocity of the
solitons, while the initial phase determines the parity (even or odd) of the
solutions. Our analytical results are compared to direct numerical integration
of the coupled Gross-Pitaevskii equations, both in the absence and in the
presence of a harmonic trap, and an excellent agreement between the two is
demonstrated.
